Please note, this is the general statement on how they work. I have not been able to find any scientific data to back this up. What I have found and heard is a lot a anecdotal evidence of the effectiveness of EM collars. Personally I use these as another line of defence. Nothing is 100% reliable.
WHAT IS EM™?
EM® stands for Effective Microorganisms®, a brand name referring to a family of microbial-based products using a technology developed by Japanese scientist Dr. Teruo Higa. The main product, EM·1®, is a liquid bacterial product comprising three groups of microbes: Yeast, Photosynthetic Bacteria, and Lactic Acid Bacteria. EM·1® works together with local and native beneficial microbes, creating a synergy among microorganisms and larger forms of life including insects and worms, pets and livestock, and people. All products using EM Technology®contain EM·1® in some part of their manufacturing process.
HOW DOES IT WORK?
EM™ (Effective Microorganism) ceramics emit far infrared waves, the longest rays in the light spectrum. This wavelength is highly compatible with human and animal tissue. The body can absorb them easily at depths up to 3 inches, where they can do lots of good work. Far Infrared waves remove blood cell clusters which improves blood circulation. Because the infrared rays penetrate the tissue, they work deep into body tissue, not just on the surface of the skin.
This improved and balanced environment in your dog (created by EM) can help keep ticks from attaching to your dog.
EM™ ceramics are made by fermenting a special clay with approximately 80 different microorganisms (EM) and then baked. The pipes are baked at 1200 C, due to the fact that in the baking process the structure of the clay changes, trapping the EM within its matrix. As a result, these EM pipes exert their influence purely through their physical properties and remain effective for a long time.
An EM™ Tick Collar can be as effective as any tick repellent found on the market, but without side effects. That makes it also safe for dogs with allergies and sensitivities. However, there is no 100% guarantee EM collars nor any other tick product will keep ticks off of our furry friends!
Nevertheless, the best prevention is to avoid known tick areas, and checking your dog AND yourself for ticks after every nature walk.
EM ceramics are safe if you have children in your household. (although, don't let the kids nor dogs eat them!)
Please note that this product does not come with a guarantee of its effectiveness. It is a natural product that uses no chemicals. Tick populations and activity vary according to region and season.